here are the spoilers for the impatient ones :
*****WARNING SPOILERS*****
michelle's dad abused ian for a long time when he was a kid, and when his pregnant wife gave birth to his son (who is michelle) he was still raping kid ian so kid ian thought of baby michelle like he is his baby too, and i dont remember if there's something else that triggered his obsession with michelle but it's the main raison he acts like that and wants to "take revenge"

yall are so not ready for the plot twist and backstory good luck surviving